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Advanced Automotive Structural Steel

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Advanced Automotive Structural Steel

Deliver standard is Q/OHAC812-2017 advanced high strength automotive structural sheet and strip

Dual phase steel

DP steel produced by LY steel is divided into Bainite DP steel and martensite DP steel. Bainite DP steel produced by LY Steel is an important grade of advanced high strength (AHSS) steel; it possesses high strength, elongation, good formability, and flanging property, which can satisfy the high requirement of formability and complex shape automotive parts such as rear axle suspension swing arm of automotive chassis. It can also be used for the parts that need to be flanged.

The flanging capacity can be identified as the hole expansion rate. As a formability index of the steel, the bearizing property reflects the capability of local crack-resistant in the direction of perpendicular to the hole edge due to the hole edge being locally elongated and too much deformed during hole expansion.

Automotive Structural Steel, Advanced Automotive Structural Steel
Automotive Structural Steel

Hole expansion molding part triantebrachia

Spoke manufactured by dual-phase steel

Martensite dual phase steel has excellent formability, high strength, low yield ratio, high original process and hardening rate, good energy absorption the strength and ductility are rationally matched. Dual phase steel has basically solved the problem that the high strength low alloy steel is not easy to be stamped and formed.Dual phase steel is good for manufacturing complex shape parts,such as spoke of auto wheel.

Mechanical property of the bainite dual phase steel

Steel gradesSupply
thickness
Yield strengthTensile strengthElongation, A80expansion rate180° Cold bending
MPaMPa%%b=35mm
FB4501.5-6.0≥300450-530≥24≥80d=0.5a
FB5901.5-6.0440-620≥580≥14≥75d=1.0a
FB7801.5-6.0600-800≥780≥12≥55d=2.0a

Remark:

1)a is test thickness, B is the width of the cold bending test, and d is bending diameter.

2)The direction of the stretching sample is Longitudinal, i.e. P14 sample in GB/T 228. The direction of cold bending is transverse, i.e. GB/T 232 flap type test.

Mechanical property of martensite DP steel

Steel gradeSupply thicknessYield strength Tensile strength Elongationn value180°  Cold bending
MPaMPaA80,%%b=35mm
DP6001.5-6.0330-470≥580≥19≥0.14d=1.0a
DP7801.5-6.0450-610≥780≥14≥0.11d=2.0a
Remark:1)a refer to sample thickness, B refer to width of cold bending sample, d refers to bending diameter。
2)The direction of stretching sample is Longitudinal, i.e.P14 sample in GB/T 228. The direction of cold bending sample is transverse, i.e. GB/T 232 flap type test.

Advanced high strength steel(AHSS)

The AHSS steel in LY Steel has high strength,elongation and good formability and hole expansion property, which can satisfy the high formability requirement of complex auto parts, such as auto suspension. Fine grain strengthening has been used in this grade, with uniform structure, fine grain and good machining property, currently it has been widely applied in the automotive industry

Automotive Structural Steel

Mechanical property

Steel gradeSupply
thickness
Yield
strength
Tensile
strength
Elongation A80180°  Cold
bending
h<2.02.0≤h<2.52.5≤h<3.25h≥3.25b=35mm
MPaMPa%
SPFH4901.5-6.0≥325≥490≥22≥23≥24≥25d=0.5a
SPFH5401.5-6.0≥355≥540≥21≥22≥23≥24d=1.0a
SPFH5901.5-6.0≥420≥590≥19≥20≥21≥22d=1.0a
SPF590HHE1.5-6.0≥420≥590≥21≥22≥23≥22d=1.0a

Remark: 1)a is test thickness, b is width of cold bending test, d is bending diameter.

2)The direction of stretching sample is transverse, i.e. P14 sample in GB/T 228. The direction of cold bending is transverse, i.e. GB/T 232 flap type test.

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